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On the Hydrorhiza and Claspers of the Hydroid Myriothela Cocksi (Vigurs)

Published online by Cambridge University Press:  11 May 2009

S. M. Manton  and
J. P. Harding
S. M. Manton
Affiliation:
Fellow of Girton College From the Zoological Laboratory, Cambridge, and the British Museam (Natural History)
J. P. Harding
Affiliation:
Fellow of Girton College From the Zoological Laboratory, Cambridge, and the British Museam (Natural History)
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Extract

The hydrorhiza of Myriothela cocksi is described. It bears adhesive tentacles covered by perisarc, which adhere to the substratum by their flattened extremities.

The chitin forming a disk of adhesion is thick, and is attached to the mesogloea of the tentacle. The terminal ectoderm persists.

The hydrorhiza of M. cocksi and of species such as M. capensis, M. penola, and M. phrygia, etc., is built on a common plan. In the latter species the perisarc is reduced to adhesive disks more firmly attached to the mesogloea.

The method of growth of M. cocksi is recorded.

The structure and method of attachment of the claspers of M. cocksi to the egg membrane is described. The mesogloea at the tip of the clasper fuses with the egg membrane after the disappearance of the terminal ectoderm.

Evidence is given for the view that the claspers of M. cocksi represent a specialized part of the hydrorhiza.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 25 , Issue 1 , February 1941 , pp. 143 - 150
Copyright
Copyright © Marine Biological Association of the United Kingdom 1941

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